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How did you meet your best friend?
In fact, the kind of friends you choose to associate with may not be as casual or "fate" as they seem, it is related to genes.
A multigenerational Framingham Heart Study (FHS) that began in 1948 analyzed nearly 1.5 million markers of genetic variation to measure the degree of genetic similarity between participants and their friends and strangers, published in PNAS.
The researchers ensured that the paired participants were not themselves related to ta's friends. But it turned out that friends were more genetically "related" than strangers: genetic similarities between a pair of friends were similar to those of a fourth cousin. That said, your great-great-great-grandparents may have decided what friends you make.
Another study of 5,500 adolescents found that friends were genetically more similar than randomly selected peers, and classmates were genetically more similar than randomly paired people.
If you compare your friends and classmates, you will find that the similarity of classmates is higher.
These conclusions may suggest that specific environments attract individuals with genetic similarity (but are not related), and sharing the same environment (schools) also greatly promotes genetic similarity.
But why did you choose certain people to make friends?
The researchers speculate that the human subconscious chooses friends based on the synergy of some genes and the complementarity of others.
Simply put, a friend may be a "functional relative." They may have a synergistic adaptive advantage, which could help drive human evolution.
bibliography
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Christakis, N. A. & Fowler, J. H. (2014). Friendship and Natural Selection. PNAS (111), 10796-10801.